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(a) One-dimensional NMR spectrum of DF1 [H2O/DMSO 90:10 (vol/vol), pH 4.0] at 600 MHz and 298 K. (b) Total correlation spectroscopy in the NH-aliphatic region. Of 47 possible NH–αCH cross peaks, 45 are observed. (c) NOESY spectrum (120-ms mixing time) in the NH–NH region.
